Thread delivery device for warp knitting machines



Nov. 30, 1937. r E. H. WIRTH 2,100,680

THREAD DELIVERY DEVICE FOR WARP KNITTING MACHINES Filed Dec. 10, 1956 I /1 yen for j z'mllzifferberi Wzrib.

Patented Nov. 30, 1937 THREAD DELIVERY DEVICE FOR. WARP KNITTING MACHINES Emil Herbert Wirth, Hartmannsdorf, near Chemnitz, Germany, assignor to the Firma Emil Wirth Wirkmaschinenfabrik, Hartmannsdorf,

near Chemnitz, Germany Application December 10, 1936, Serial No. 115,217 In Germany December 11, 1935 4 Claims.

The present invention relates to a thread delivery device for high speed warp knitting machines.

Thread delivery devices for high speed warp 5 knitting machines are known in which the thread operates on an axially displaceable shaft whichis kinematically connected with the warp beam by means of a worm gear and on which is carried one part of a clamp roller coupling which by axial displacement of the shaft can, when desired, be brought into operative connection with the other part of the coupling which is constantly driven from the cam shaft of the machine. In thread delivery devices of this kind the driv- 15 ing device is disposed beneath the individual thread delivery devices on the frame of the machine in the immediate vicinity of the cam shaft. The delivery devices are operated by way of this common driving device from the cam shaft.

In this manner a reliable and rapid control of the drawing ofi of the thread is obtained, but the shafts carrying the worm gear drive for the warp beams are of rather considerable length. A common brake mechanism serves to brake the displaceable shafts. Due to the great length of the shafts oscillations are unavoidable and, moreover, the shafts are bent by the common brake acting upon them, so that the part of the \elamp roller coupling mounted upon the shaft w is unfavorably affected. Furthermore, the arrangement is such, that the brake mechanism must be lifted together with the shafts.

The object of the present invention is to obviate the above mentioned drawbacks. 35 According to the invention the clamp roller coupling is mounted in the upper part of the machine, whereby the length of the shafts is considerably reduced, so that a smoother and easy operation is obtained and oscillations-or 40 vibrations are obviated. Instead of a common brake, each shaft is provided with its own automatically operating brake. The brake drums form a unit with the worms and need no longer be lifted together with the shafts.

$ In the accompanying drawingone embodiment of the invention is shown by way of example.

In this drawing:

Fig. 1 is a part sectional side elevation of a de- 50 vice according to the invention looking from the interior of the machine and Fig. 2 shows a detail view, partly in section. As shown in Fig. 1, brackets I, one of which only is illustrated, are fixed by screws 2'to the 55 frame 3 of the warp knitting machine. In the bracket I warp beam shafts (land 4' are journalled. The bracket i carries bearings 5, 5 and i which are fixed by screws 8, 9 and Hi respectively. Journalled in thebearings 5, 6 and I and adapted to longitudinally slide therein is 5 a shaft ii. Between the bearings 5 and ii a worm I2 is mounted upon the shaft H which, as shown in Fig. 2; is fixed by a wedge 13 so as to rotate with the shaft H but allow movement of the latter in the longitudinal direction. The worm I 2 engages'a worm wheel M fixed upon the warp beam shaft l.

A shaft l5 journalled in the bracket l carries a thread guide lever Ni, ii one arm it of which is provided at its free end with a roller 18. Over 15 the latter the thread 19 delivered by. the Warp beam is guided to the working station of the machine not shown on the drawing. The other arm ll of the thread guide lever l6, Ill is forked and pivoted to pins 20 of a ring 21! mounted upon 20 the-shaft I i. The lower face of the ring 21! bears against a ring 22 fixed to the shaft H by means of a screw 23. Near the upper bearing 1 for the shaft H a 'ring M is connected to the latter by means of a screw 25. A helical spring 26 surrounding the upper end of the shaft II bears against the rings and 2!. By adjusting the rings Ziand 24 the tension of the spring may be altered as desired.

The'hub 21 of the worm 42 extends beyond the 30 hearing 6 and carries a brake drum 23 fixed. thereto by a wedge 29. Brake jaws 30 and 3! pivotally connected together by a pin 32' are arranged upon the brake drum 28. The brake jaw 30 is provided with a projection 33 which bears against the wall of the bracket I. The brake jaw 3| is provided with a projection 34 bearing against a projection 35 fixed to the wall of the bracket I. Near the free end of the brake jaw 30, a bent or curved rod 36 is fixed which extends through an enlarged bore 31 provided in the free end of the brake jaw 31'. The free end of the bent rod 36 carries a thread 38 upon which a wing nut 39 is screwed. Between the wing nut 39 and thefbrake jaw 3| a helical spring 40 surrounds the rod 36. By adjusting the wing nut 39 the pressure of the brake jaws 30, 3| againstjthe brake drum 28 may be regulated as desired. The projections 33 at the one hand and 34, 35 at the other hand prevent deflections and bendings of the shaft ll. 1

' A second construction exactly similar to that described with the aid of reference characters 4-40 is provided at the bracket I and the individual parts of this construction are designated by the same reference characters 4-40 each provided with an index. This second construction serves to control the warp beam shaft 4' in exactly the same manner as the first construction, described in detail, controls the warp beam shaft 4. The only difference between the two constructions is that in the first case the brake mechanism is mounted above the worm gear, and in the second case below same and consequently the longer bearing 6 is provided above the shorter bearing 5, whereas the longer bearing r5 lies below the shorter bearing 5'.

Both shafts II and II extend downwardly into a housing lI carried by the bracket I. The lower end of each shaft I l and I I carries a clamp roller coupling to be described presently and both shafts are connected to a common drive mechanism. As the clamp roller couplings for the two shafts are of the same construction, the description of one of same is deemed suflicient.

In the centre of the housing il, a bearing 42 is provided in which a vertical shaft 43 is journalled. The shaft 43 carries between its ends a gear wheel 44 and at its upper end a bevel gear wheel 45. The bevel gear wheel 65 engages with another bevel gear wheel d6 which is fixed to a horizontal shaft driven from the cam shaft of the machine not shown in the drawing. The housing QI is provided with two further bearings 48, 48' and in each of these bearings a sleeve 49, 49' is fixed by a set screw 50, 50' respectively.

The lower end of the sleeve 49 has a plate-like enlargement 5I from which'is suspended a guide sleeve 52 for conical clamp rollers 53. Mounted on the sleeve 69 within the housing M is a sleeve 54 which is fixed by a set screw 55. The lower end 56 of the sleeve 5 3 is bell-shaped and to the cylindrical portion of this sleeve 9. gear wheel 51 is secured. The latter engages with the gear wheel 44 fixed to the shaft 63.

Carried on the lower end of the shaft Ii is a conically shaped member 58.

The housing ii carrying the clamp roller coupling arrangement is constructed as a closed oil container, so that the couplings run in an oil bath.

The shaft 41 is continuously driven from the cam shaft of the machine, whereby the gear whee; M is also rotated by means of the bevel gea wheels 45, 46. By means of the gear wheel M the gear wheel 51 together with the bell-shaped sleeve 54, 56 are rotated and thereby the motion is transmitted to the clamp rollers 53 carried on the guide sleeve 52.

The arm I6 of the thread guide lever l6, I1 is held in the upward position by means of the spring 26, whereby the shaft II, controlled by the lever I6, I1, is urged downwardly. The shaft II is, as indicated above, similarly controlled. The element 58 carried on the shaft I I is thus only loosely in engagement with the clamp rollers 53, so that the latter are not capable of causing the element 58to participate in the rotation.

If now warp threads are required, then under the action of the tightening thread IS the arm I6 of the thread guide lever IS, IT isx depressed and the shaft I I (or II) is raised by means of the arm "of the thread guide lever I6, I! against the action of the spring 26. Consequently the element 58 is also raised and comes into contact with the clamp rollers 53, so that the latter can now trans-, mit their motion to the element 58, and thus to the shaft II (or II). By means of the worm I2 carried on the shaft H the motion is transmitted to the worm wheel I4 which rotates the warp beam shaft 4 and thereby the warp beam causing the supply of thread.

As soon as the delivery of thread has been efiected, the guide lever I6, I! is swung by the spring 26, whereby the shaft II is lowered and the clamp rollers 53 cease to operate on the element 58.

By means of the brake mechanism 30-39 the shaft II is held against rotation except when driven and is prevented from overrunning which would result in automatic release of the coupling,

What I claim is:

1. A thread delivery device for high speed warp knitting machines, comprising a bracket fixed to the frame of the warp knitting machine, warp beam shafts journalled in said bracket, axially displaceable'shafts rotatably mounted in bearings fixed to said bracket, means for shifting said axially displaceable shafts by the warp threads supplied to the machine, a worm wheel, connected to each of said warp beam shafts, worms engaging with said worm wheels mounted upon said axially displaceable shafts, wedges slideably connecting said worms to said axially displaceable shafts, a brake mechanism mounted upon a hub portion of each worm extending beyond the bearing member, a casing fixed to said bracket, and a clamp roller coupling arrangement provided in said casing and adapted to transmit motion from the cam shaft of the warp knitting machine tosaid warp beam shafts.

2. A thread delivery device as set forth in claim 1 in which said means for shifting said axially displaceable shafts consist of a doublearmed lever associated with each of said displace;- able shafts and pivoted upon a bolt fixed to said bracket, one "arm of said double-armed lever carrying a roller guiding the warp thread, while the other arm being pivoted to pins carried by a ring mounted upon said displaceable shaft, a helical spring, acting upon said double-armed lever and surrounding said displaceable shaft, bearing against said ring and a second ring adjustably fixed to said displaceable shaft at a distance from said first mentioned ring.

3. A thread delivery device as set forth in claim 1 in which said brake mechanism consist of a brake drum fixed to the hub ofsaid worm and brake jaws linked together and surrounding saidbrake drum, one of said brake jaws being provided with a projection bearing against said bracket and carrying a curved rod, while the other of said jaws is provided with a projection bearing against a projection fixed to said bracket, the free end of .said last mentioned brake jaw being provided with an enlarged bore for the passage of said curved rod, said curved rod carrying a thread upon which a wing nut is screwed, serving to more or less tension a helical spring surrounding said curved rod and bearing against said wing nut and said last mentioned brake jaw.

4. A thread delivery device for high speed warp knitting machines, comprising a bracket fixed to the frame of the warp knitting machine, warp beam shafts journalled in said bracket, axially displaceable shafts rotatably mounted in bearings fixed to said bracket, a double-armed lever associated with each of said axially displaceable pivotally connected to said fork, a helical spring surrounding each of said axially displaeeable shafts, a second ring adjustably fixed to each axially displaceable shaft at a distance from said first mentioned ring, said helical spring being arranged between said two rings,'a worm wheel .fixed to each of said warp beam shafts, a worm mounted upon each of said axially displaceable shafts, a wedge slideably connecting saidworm with said corresponding axially displaceable shaft, a brake drum fixed to the hub of each of the worms, brake jaws pivotally connected together and surrounding said brake drum, a; projection provided at one of said brake jaws directly bearing against said bracket, a curved rod fixed near the free end of said brake jaw, a projection provided at the other of said brake jaws, bearing against a projection provided at said bracket, an

enlarged bore for the passage of said curved rod provided at the free end of said last mentioned brake jaw, a thread-ton the free end of said curved rod, a wing nut screwed upon said thread, a helical spring surrounding said curved rod and bearing against said last mentioned brake jawand said wing nut, a closed casing fixed to said brack-. et, a conical part provided at the lower end of each of said axially displaceable shafts extendfixed to the cylindrical portion of said third sleeve, a vertical shaft mounted in said casing,

a gear wheel fixed to said vertical shaft and engaging said gear wheel fixed to said third sleeve, and a bevel gear' wheel fixed to the upper end of said vertical shaft engaging a bevel gear wheel driven by the warp knitting machine.

EMIL HERBERT WIRTH. 

